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Ammonium Sulfite Slurry from Ammonia-Based Desulfurization Activates Water-Soluble Humic Substances from Lignite:
Shanshan Zhao1, Denglun Chen1, Yuanyuan Yao1
1National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources; National Engineering & Technology Research Center for Slow and Controlled Release Fertilizers, College of Resources and Environment, Shandong Agricultural University, Taian 271018, Shandong, China.
Journal of Agricultural and Food Chemistry
|September 6, 2023
Summary
Ammonium sulfite slurry (ASS) waste activates lignite to produce valuable water-soluble humic substances (WHSs). This sustainable method enhances WHS yield and bioactivity, offering agricultural benefits.
Area of Science:
- Environmental Chemistry
- Sustainable Materials Science
- Agricultural Science
Background:
- Ammonium sulfite slurry (ASS) and lignite are low-value waste materials.
- There is a need for sustainable methods to valorize industrial byproducts.
- Humic substances (WHSs) have potential agricultural applications.
Purpose of the Study:
- To develop an innovative method for activating lignite using ASS.
- To produce high-value water-soluble humic substances (WHSs) from lignite.
- To investigate the properties and bioactivity of WHSs derived from activated lignite.
Main Methods:
- Lignite activation using ammonium sulfite slurry (ASS) at a 4:1 liquid-solid ratio.
- Optimization of activation conditions: vortex blending and 30 min oscillation at 25 °C.
- Characterization of WHSs using chemical analysis and bioactivity assays (root elongation).
Main Results:
- A 42.72% increase in WHS yield from activated lignite (AL) compared to unactivated lignite (UAL).
- WHSs from AL showed lower molecular weight, abundant aliphatic carbons, and functional groups like amides, amines, and sulfonic acid.
- WHSs from AL demonstrated a stronger root-elongation-promoting effect at lower concentrations than WHSs from UAL.
Conclusions:
- ASS effectively activates lignite, breaking key carbon linkages and increasing WHS yield.
- Activated lignite yields WHSs with enhanced bioactivity, particularly for promoting plant root elongation.
- This research provides a sustainable pathway for the beneficial reuse of ASS and lignite in agriculture.
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